The blood oxygen saturation (SpO₂) is the percentage of hemoglobin in the blood that contains oxygen, in other words, the amount of oxygen in the blood. It is a useful natural indicator of the condition of a person's respiratory system.

If your SpO₂ is below 90%, you may be at the risk of developing hypoxemia.

Generally speaking, the lower your SpO₂, the higher the risk. Green dots indicate that your SpO₂ was equal to or higher than 90% for that measurement, and the orange ones indicate that your SpO₂ was between 70% and 89%.

The device's measurement range is 70% to 100%.

The following user groups may want to pay extra attention to their SpO₂ levels.

People who snore: Snoring can cause respiratory obstruction for short or long periods of time, which can cause oxygen deficiency, poor sleep quality, and even organ damage.

People who work long hours: These people's brains tend to consume more than others. If their brain isn't able to get enough oxygen for a long period of time it can lead to sleepiness, sleeplessness, and reduced memory abilities.

Older people and people using oxygen ventilators: The heart and lungs of the elderly people are naturally older, and are more prone to not being able to intake enough oxygen and a low oxygen supply. If the results are below the advised value, make sure to add oxygen in a timely manner.

People living at extremely high altitudes with thinner air: Altitude has a large impact on people's SpO₂ levels. The air is thinner in high-altitude areas, meaning there is less oxygen, which could lead to a lack of oxygen, and could cause symptoms like dizziness and altitude sickness. If your SpO₂ is below 90%, you may be at the risk of suffering from the aforementioned risks.

How SpO₂ is measured using your wearable devices: Huawei wearable devices measure your SpO₂ based on optimized hardware optical technology and algorithms. Oxygenated hemoglobin and deoxyhemoglobin have different reflection and absorption rates for certain light rays, by leveraging this difference, the wearable device uses various algorithms to extract the data and calculate the blood oxygen saturation.

Note when measuring SpO₂

1. Enable SpO2 on your wearable device first. For accurate results, follow the instructions for your device.

2. Certain external factors may interfere with the measurement, causing it to be inaccurate or even fail. These include low blood perfusion, arm hair, tattoos, incorrect posture, moving your arm during the measurement, not wearing your device correctly, room temperature, and so on.

The wearable device is not designed for medical use, results should not be used for medical diagnosis or treatment.